Relevant bibliographies by topics / Grindability of coal

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Academic literature on the topic 'Grindability of coal'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Grindability of coal"

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Radic, Dejan, Marko Obradovic, Miroslav Stanojevic, Aleksandar Jovovic, and Dragoslava Stojiljkovic. "A study on the grindability of Serbian coals." Thermal Science 15, no. 1 (2011): 267–74. http://dx.doi.org/10.2298/tsci1101267r.

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Thermal power plants in the Republic of Serbia are making considerable efforts and even more considerable investments, not only to maintain electricity production at maximum design levels, but even to additionally increase the power output of existing generating units. Capacities of mills used in pulverized coal preparation are identified as one of the main constraints to achieving maximum mill plant capacity, while coal grindability is seen as one of the factors that directly affect capacities of the coal mills utilized in thermal power plants. The paper presents results of experimental investigation conducted for the purpose of determining Hardgrove grindability index of coal. The investigation was conducted in accordance with ISO 5074 and included analysis of approximately 70 coal samples taken from the open pit mine of Kolubara coal basin. Research results obtained indicate that coal rich in mineral matter and thus, of lower heating value is characterized by higher grindability index. Therefore, analyses presented in the paper suggest that characteristics of solid fuels analyzed in the research investigation conducted are such that the use coals less rich in mineral matter i. e. coals characterized by lower grindability index will cause coal mills to operate at reduced capacity. This fact should be taken into account when considering a potential for electricity production increase.
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Bilen, Mehmet, Sait Kizgut, A. Cuhadaroglu, Serdar Yilmaz, and İhsan Toroglu. "Coal Grindability and Breakage Parameters." International Journal of Coal Preparation and Utilization 37, no. 5 (June 13, 2016): 279–84. http://dx.doi.org/10.1080/19392699.2016.1173686.

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Obradovic, Marko, Dejan Radic, Dusan Todorovic, Aleksandar Jovovic, Nikola Karlicic, and Miroslav Stanojevic. "Practical assessment of grinding capacity and power consumption based on Hardgrove grindability index and coal characteristics." Thermal Science 23, Suppl. 5 (2019): 1533–42. http://dx.doi.org/10.2298/tsci1806053760.

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This paper analyzes the effects of coal grindability and its characteristics on the grinding capacity and power consumption for beater wheel mill during exploitation in thermal power plant TENT B in Obrenovac, Serbia. For this purpose, experiments were made on the mill, before and after its reconstruction. Experiments included the determination of grinding capacity, mill power consumption, and laboratory analysis of coal characteristics and Hardgrove grindability index (HGI). The analysis of experimental results found that the grinding capacity has a negative correlation with the ash content in coal. Moisture content in analysis sample of coal has a positive correlation with the consumption of electricity and grinding capacity. Between the grinding capacity and the value of HGI exists a negative correlation. Analysis of the influence of grindability of coal and coal characteristics on grinding capacity and energy consumption was carried out. Based on coal characteristics and values of HGI, mathematical expressions were derived for the calculation of grinding capacity and electric energy consumption. In addition, ability to predict specific power consumption of the mill on the basis of HGI values, were carried out. Specific power consumption obtained from HGI values showed good agreement with the experimentally determined specific power consumption of the mill.
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Nunes, Leonel J. R. "Torrefied Biomass as an Alternative in Coal-Fueled Power Plants: A Case Study on Grindability of Agroforestry Waste Forms." Clean Technologies 2, no. 3 (July 20, 2020): 270–89. http://dx.doi.org/10.3390/cleantechnol2030018.

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The use of biomass as a renewable energy source is currently a reality, mainly due to the role it can play in replacing fossil energy sources. Within this possibility, coal substitution in the production of electric energy presents itself as a strong alternative with high potential, mostly due to the possibility of contributing to the decarbonization of energy production while, at the same time, contributing to the circularization of energy generation processes. This can be achieved through the use of biomass waste forms, which have undergone a process of improving their properties, such as torrefaction. However, for this to be viable, it is necessary that the biomass has a set of characteristics similar to those of coal, such that its use may occur in previously installed systems. In particular, with respect to grindability, which is associated with one of the core equipment technologies of coal-fired power plants—the coal mill. The objective of the present study is to determine the potential of certain residues with agroforestry origins as a replacement for coal in power generation by using empirical methods. Selected materials—namely, almond shells, kiwifruit pruning, vine pruning, olive pomace, pine woodchips, and eucalyptus woodchips—are characterized in this regard. The materials were characterized in the laboratory and submitted to a torrefaction process at 300 °C. Then, the Statistical Grindability Index and the Hardgrove Grindability Index were determined, using empirical methods derived from coal analysis. The results obtained indicate the good potential of the studied biomasses for use in large-scale torrefaction processes and as replacements for coal in the generation of electrical energy. However, further tests are still needed, particularly relating to the definition of the ideal parameters of the torrefaction process, in order to optimize the grindability of the materials.
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Sengupta, Ambar Nath. "An assessment of grindability index of coal." Fuel Processing Technology 76, no. 1 (April 2002): 1–10. http://dx.doi.org/10.1016/s0378-3820(01)00236-3.

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Bilen, Mehmet, Sait Kızgut, Serdar Yilmaz, Kemal Baris, and Dilek Cuhadaroglu. "Grindability of Coal Changing with Burial Depth." International Journal of Coal Preparation and Utilization 38, no. 2 (August 3, 2016): 75–87. http://dx.doi.org/10.1080/19392699.2016.1196199.

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Lytle, J., N. Choi, and K. Prisbrey. "Influence of preheating on grindability of coal." International Journal of Mineral Processing 36, no. 1-2 (September 1992): 107–12. http://dx.doi.org/10.1016/0301-7516(92)90067-7.

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Marland, S., B. Han, A. Merchant, and N. Rowson. "The effect of microwave radiation on coal grindability." Fuel 79, no. 11 (September 2000): 1283–88. http://dx.doi.org/10.1016/s0016-2361(99)00285-9.

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OKI, Tatsuya, Junichi TANAKA, and Taneomi HARADA. "Cause of Coal Grindability. Correlation of coal rank, maceral composition, hardness, and brittleness." Shigen-to-Sozai 112, no. 1 (1996): 37–42. http://dx.doi.org/10.2473/shigentosozai.112.37.

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Matin, S. S., James C. Hower, L. Farahzadi, and S. Chehreh Chelgani. "Explaining relationships among various coal analyses with coal grindability index by Random Forest." International Journal of Mineral Processing 155 (October 2016): 140–46. http://dx.doi.org/10.1016/j.minpro.2016.08.015.

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Dissertations / Theses on the topic "Grindability of coal"

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Marland, Stephen Alan. "Microwave beneficiation of coal to improve grindability and handleability." Thesis, University of Birmingham, 2001. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369178.

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Experimental results and analyses have shown that significant improvements in coal grindability (reductions in Relative Work Index) can be achieved by exposing coals to microwave radiation. Experimental data have indicated that low rank coals are highly responsive to microwave radiation, possibly due to their higher inherent moisture content. There is evidence to suggest that gaseous evolution (water vapour and volatile matter) and localised zones of differential expansion (arising for example from occluded mineral matter) in coal during heating give rise to crack formation and hence are the probable causes for the measured increase in coal grindability. The composition of the various coals treated by microwave radiation remained relatively unaltered and there was no significant change in coal calorific value or the proximate and ultimate analyses (dry, mineral matter free basis). Initial (laboratory-scale) microwave trials and pilot-scale testwork demonstrated an improvement in the grindability of various coals. However, the gross energy input for these tests were excessively high (220k WhIt) in comparison to that used mechanically for pulverised coal production (15-20kWhlt). Improvements in microwave cavity design and increased electric field strengths may increase the energy efficiency of the process; however, further work would be required. Additional studies were carried out to evaluate the potential use of microwave technology for coal desulphurisation. The results were encouraging and show that substantial improvements in pyrite separation can be achieved with some coals. Fundamental studies have shown that there is significant change in coal flowability following microwave exposure.
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Kubínek, Martin. "Návrh mlýnského okruhu kotle PK 4S v Teplárně Košice." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232164.

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The aim of this thesis is the proposal of a coal mill system and a combustion chamber for the boiler PK 4S situated in Košice CHP station with regard to transition to the new fuel. This proposal is focused on the elimination of NOx emissions. The calculation is based on required parameters of the boiler and declared characteristic of the new fuel. The proposal of the coal mill system includes three roller mills working in closed circuit with direct blowing. One of the mills serves as a reserve in case of failure. Dimensions of the dry bottom combustion chamber are proposed considering the applied primary measures to reduce NOx emissions so that the temperature at the end of the furnace would not be higher than maximal allowed temperature 1200 °C.
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Books on the topic "Grindability of coal"

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Marland, Stephen Alan. Microwave benefication of coal to improve grindability and handleability. Birmingham: University of Birmingham, 2000.

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Book chapters on the topic "Grindability of coal"

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Zhi-jun, He, Pang Qing-hai, Zhang Jun-hong, Zhan Wen-long, and Zhe Ning. "Effect of Microwave Irradiation on Improving Coal Grindability." In Energy Technology 2016: Carbon Dioxide Management and Other Technologies, 145–50. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274704.ch17.

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Zhi-jun, He, Pang Qing-hai, Zhang Jun-hong, Zhan Wen-long, and Ning Zhe. "Effect of Microwave Irradiation on Improving Coal Grindability." In Energy Technology 2016, 145–50. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48182-1_17.

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Conference papers on the topic "Grindability of coal"

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Matali, Sharmeela, Norazah Abdul Rahman, Siti Shawaliah Idris, and Nurhafizah Yaacob. "Combustion properties, water absorption and grindability of raw/torrefied biomass pellets and Silantek coal." In ADVANCED MATERIALS FOR SUSTAINABILITY AND GROWTH: Proceedings of the 3rd Advanced Materials Conference 2016 (3rd AMC 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.5010527.

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Saifujjaman, Md, Kwangkook Jeong, and Shinku Lee. "Modeling for Mineral Redistribution of Coal Blending During Pulverized Coal Combustion." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87834.

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This paper represents an analytical model for predicting mineral particle redistribution of coal blending during pulverized coal (PC) combustion in a pulverized coal-fired boiler. The objective of this research is to develop a computer program to perform the mass balance of total minerals after transformation during combustion. A MATLAB code was developed for coal blending mineral redistribution from single coal mineral redistribution in modular approach based on relative Hardgrove Grindability Index (HGI) of coals. The calculations of the single coal number of ash particles before and after combustion both for excluded and included minerals from the single coal proximate analysis, Malvern analysis, Computer Controlled Scanning Electron Microscopy (CCSEM) analysis, density and composition analysis were designed in a submodule. Utilizing single coal sub-module, the calculations of coal blending number of ash particles before and after combustion both for excluded and included minerals were designed in a module of MATLAB code. The blending modeling was designed to blend up to five sub-bituminous coals. Calculations were made for typical boiler combustion conditions ranging from 1,500K to 2,500K as flame temperature. The organically-associated ash content or mineral grains of each coal smaller than 1 micrometer was not included in the calculation of redistribution modeling. Coal particle fragmentation of blended coal was considered as same as single coal and size dependent phenomena. Partial coalescence model was assumed as more likely to occur. Blended coal was assumed to follow additive rule applied to mineral mass percentage based on sizes and mineral phase regardless grinding of coals separately or after blending if the HGI difference between highest and lowest HGI of coals arranged in ascending order stands within five. The modeling was demonstrated for KPU: AVRA and AVRA: Solntsevsky with specific blending ratio 80:20 and 20:80 respectively. The model for blended coal was validated by the mass balance of minerals before and after combustion. The resulting simplified particle size distribution of mass fraction of KPU: AVRA shows good agreement with experimental results of Kentucky #9 coal because of having a larger amount of included minerals of KPU coal. The model for blended coal mineral redistribution before and after combustion will be developed for the HGI difference between highest and lowest HGI of coals arranged in ascending order becomes greater than five and validated by minerals mass balance before and after combustion. This modeling will be used to predict number of mineral particles and its sizes that is a key parameter as to predict the problems like fouling and slagging and the related reduction of boiler efficiency. The results from this study will be further carried out to investigate ash deposition rates in post-boiler heat exchangers.
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Bhattacharya, Chittatosh. "Capacity Mapping for Optimum Utilization of Pulverizers for Coal Fired Boilers." In ASME 2006 Power Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/power2006-88005.

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The pulverizer plays a pivotal role in coal based thermal power generation. The improper coal fineness or drying reflects a quality-wise deterioration. This results in flame instability, unburnt combustible loss, and a propensity to slagging or clinker formation. Simultaneously, an improper air-coal ratio may result in either the coal pipe choke or the flame impingement, an unbalanced heat release, an excessive FEGT, overheating of the tube metal, etc, resulting on the reduced output and excessive pulverizer rejects. In general, the base capacity of the pulverizer is a function of coal and air quality, conditions of grinding elements, classifier and other internals. The capacity mapping is a process of comparison of standard inputs with actual fired inputs to assess the available standard output capacity of the pulverizer. In fact, this will provide a standard guideline over operational adjustment and maintenance requirement of the pulverizer. The base capacity is a function of grindability; fineness requirement may vary depending upon the volatile matter content of the coal and the input coal size. The quantity and inlet temperature of primary air limits the drying capacity. The base airflow requirement will change depending upon the quality of raw coal and output requirement. It should be sufficient to dry pulverized coal. Drying capacity is also limited by utmost P.A. fan power to supply air. The P.A. temperature is limited by APH inlet flue gas temperature — an increase of this will result in efficiency loss of the boiler. Besides, the higher P.A. inlet temperature can be attained through economizer gas by-pass, the SCAPH, partial flue gas recirculation. The primary air/coal ratio, a variable quantity within the pulverizer operating range, increases with decrease in grindability or pulverizer output and decreases with decrease in volatile matter. Again, the flammability of mixture has to be monitored on explosion limit. Through calibration, the P.A. flow and efficiency of conveyance can be verified. The velocities of coal/air mixture to prevent fallout or to avoid erosion in the coal carrier pipe are dependent on the pulverized coal particle size distribution. Metal loss of grinding elements inversely depends on the YGP index of coal. Besides, variations of dynamic load on grinding elements, wearing of pulverizer internal components affect the available pulverizing capacity and percentage rejects. Therefore, the capacity mapping is necessary to ensure the available pulverizer capacity to avoid overcapacity or under capacity running of pulverizing system, optimizing auxiliary power consumption, This will provide a guideline on the distribution of raw coal feeding in different pulverizers of a boiler to maximize operating system efficiency and control resulting a more cost effective heat rate.
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Parker, Ken R., Jeff Allen, and Anupam Sanyal. "Benchmarking Software for Slagging, Fouling and Other Parameters to Improve Coal-Fired Power Plant Load Factor, Efficiency and Emission." In ASME 2006 Power Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/power2006-88249.

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For a 500 MW unit, a 1 % reduction in boiler efficiency equates to a coal cost in the order of $ 1/2 million/annum, while a 5 % unit derate, needed to meet emission compliance, can equate to an annual revenue loss of up to $ 12 million. Many software products are in use, which based on the present plant performance, identify and optimize the operational parameters for the best plant capacity, utilization and efficiency. While they are effective in tuning up the unit, they are applied to an operating plant firing a given coal for the given performance. But what if there were a means of predicting how a coal will perform with respect to slagging, fouling and every other single parameter involved in the use of that coal for capacity, efficiency maximization and emission control without firing even a lb of coal? This would enable the operator to know in advance what to expect and thereby, adjust the operating variables to get the best out of that coal. Such a software product – SCES (Steam Coal Evaluation & Services) has been developed based on the fundamental principles of combustion, mineral matter transformation and emission of particulates, NOx, SO2 and mercury, based on only the standard ASTM coal and ash analyses. The operational parameters evaluated are: Slagging and fouling as well as Grindability, Abrasion of the grinding elements; Combustibility & Unburnt carbon, Corrosion and Erosion; Emission of particulates, the oxides of sulfur and nitrogen (both primary and secondary DeNOx) as well as mercury when data are available. Its advantage over the existing products is its ability to predict, amongst others parameters, corrosion, erosion of convective tubes and the life of grinding elements none of which are discernible from the existing software products or from a limited test burn. These parameters however play important roles in the bottom line O & M costs. The implementation of SCES in providing meaningful rankings alerts the plant operators to the performance they can expect and any measures that need to be taken to be able the plant to operate at its highest load factor and efficiency while under emission compliance with minimum impact on O & M cost. No separate coal sample or small-scale laboratory evaluation work is required in the derivation of the rankings. Because of its simplicity of use and immediate availability of results, SCES can also be used as a routine analytical tool, accompanying the coal analyses by the plant or supplied with each delivery of coal. It is applicable to all coals irrespective of rank and country of origin, it has been used and validated on coals from the US, UK, Russia, Columbia and India. The paper describes the fundamental properties coal used in the development of the software and cites case histories of its validation on US (Bituminous & Sub-bituminous) coals.
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